<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script type="text/javascript">
        // 方式1
        let obj = {name:"lisi",age:18}
        console.log(obj['name']);//lisi
        
        // 方式2
        let a = "name"
        let obj2 = {} 
        obj2[a]='tom'
        console.log(obj2);//{name: 'tom'}
    </script>
</body>
</html>